I don't know why this is so complicated, its birth control and abortion. People typically don't plan kids, they just happen every 3 or 4 years. Woman now have

I don't know why this is so complicated, its birth control and abortion. People typically don't plan kids, they just happen every 3 or 4 years. Woman now have the choice to delay child birth as long as they want. The average in my country is 30 years ago. In the past a woman would have already been on children number 2 or three by this point. Having a child at 40 while possible its a lot harder than 20. So you have less child bearing years remaining. This explains everything, educated people are more likely to make sound financial choices and delay their first child. Also houses security and finance security is a large factor in abortion in my country and Korea a well studied for their low birth rate. Their are more abortions than births in my country. I'm not making a political statement its just the situation we live in where you need two incomes just to be lower middle class. Interestingly Chinese in my country have the most abortions followed by Indians. This is probably due to cultural reasons and not wanting to be disowned by ones parents for 'Throwing your life away'.